Isabel @beamshift

making things happen with electron microscopes🔬 she/her 🐘: https://t.co/R0PzrAIen6 🦋: https://t.co/q3MDRCDW1D beamshift.net back focal plane (oregon) Joined March 2022

Tweets

752
Followers

2K
Following

2K
Likes

14K

Isabel @beamshift

2 days ago

@CALVINGINEERING @CR4163R You might look into machining a groove that you can compress the seal into. This has some info on tolerances for o-ring grooves cas.web.cern.ch/sites/default/…

0 0 1 19 0

View Details

Isabel @beamshift

2 days ago

@CALVINGINEERING @CR4163R Also you want to avoid any silicone grease in a vacuum system with an electron beam, because you’ll get SiO2 deposition

2 0 1 24 0

View Details

Mehdi @MehdiHacks

3 days ago

Reminder: protect the connectors on your precious RF tools and SDRs when you are not using them. Usually called dust caps, they are available for any type of connector you imagine.

9 2 134 6K 28

View Details

Isabel @beamshift

2 days ago

@fishPointer 3D or 2D?

1 0 3 348 0

View Details

Anna Riedl @AnnaLeptikon

4 days ago

Lithography is the technology, that forces rocks to think by engraving runes.

83 564 7K 409K 2K

View Details

In 1911, Heike Kamerlingh Onnes, by virtue of being the first person to liquify helium, serendipitously discovered that the resistance of mercury dropped to zero below 4.2K–the first superconductor. For the next decades, some of the luminaries of 20th century physics tackled the superconductivity problem, without achieving the holy grail of a microscopic theory about why it happens. It was not until two smoking gun experiments in the 1950s pointed in the correct direction: isotope effect experiments in mercury showed that the atomic lattice, not just electrons, were implicated, and low-temperature specific heat experiments gave evidence for a small energy gap associated with the superconducting state. These key experiments were among thousands of valid works about superconductivity, and certainly no one knew what would be the smoking gun experiment in 1911 or even in 1941 (the author of the isotope effect paper even stated that their motivation was that they had different isotopes of mercury laying around). With all the key observations in place, Bardeen, Cooper, and Shrieffer were able to formulate the BCS theory explaining what is now called the ‘conventional’ type of superconductivity. This history illustrates the important role of serendipity and path-dependence in superconductivity research (as well as other areas dealing with complex many-body systems). If Onnes chose to measure aluminum instead of mercury, he would not have discovered superconductivity when he did; if someone had tried to FAFO superconductivity in different isotopes of a metal earlier, the mechanism of superconductivity could have been established much sooner. Similarly if superconductivity was discovered in Ba1-xKxBiO3 (BKBO, Tc up to 34K) *before* it was discovered in La2-xBaxCuO4 (LBCO, Tc up to 35K, first cuprate discovered), humanity could have gone another generation without discovering cuprate superconductivity in excess of liquid nitrogen temperatures.

2 9 88 6K 13

View Details

max @shir0kawa

4 days ago

Anyone in nyc enjoy building things and want free gear? 3D printer kits, conflat vacuum chambers, lasers, optics, glassware, electronic test equipment etc . Morningside heights Manhattan dm me

3 7 23 2K 3

View Details

allisx86 @allisx86

2 weeks ago

54 550 8K 107K 447

View Details

Isabel @beamshift

a week ago

@REALFREEDOMCAT @bebeal_ vacuum systems are my circus and particle beams are my monkeys

0 0 2 31 0

View Details

Isabel @beamshift

a week ago

@bebeal_ it’s the detector for the mass spec

1 0 4 102 0

View Details

Isabel @beamshift

a week ago

@bebeal_ discrete dynode electron multiplier!

2 0 7 201 0

View Details

Isabel @beamshift

a week ago

@2998x10tothe8 @0xJirachi could be silver coated copper

0 0 3 22 0

View Details

Isabel @beamshift

2 weeks ago

@0xJirachi CERN has some of the best resources on UHV cleaning and handling procedures

0 0 1 18 0

View Details

Isabel @beamshift

2 weeks ago

@0xJirachi how high is your vacuum?

0 0 1 31 0

View Details

Jirachi🌟 @0xJirachi

2 weeks ago

tomorrow at 1pm i need skilled hands who have a desire to disassemble extremely cool scientific equipment if you are in sf and have ever wanted to do something like that please message me and come help